Method of producing augers



Nov.. E3 i923. 11A-74,035@

A. W. MCCURDY METHOD 0F' PRODUCING AUGERS Filed May 20. 1920 gmc/wiwi sassari New. ia reas. lltfligtlafil ARTHUR W. IVICCURDY, OF VICTORIA, BRITISH COLUMBIA, CANADA.

METHOD F PRODUCING AUG-ERS.

Application led May 20, 1920; Serial No. 382,994.

To @Zlio/omit may] concern.' decreasing in pitch to the line A--A where Be it lrnown that l, ARTHUR VJ. Moit assumes an angle of 33, and such angu- CURDY, a subject of the King of England, larity is continued from that point on to the residing` at Victoria, British Columbia, Candischarge end of the die.

ada, have invented certain new and useful ln practice, the die is mounted in a holder, 60 Methods of Producing Angers, of which the the body of which is denoted by 4, and from following is a speciiication. which entends a tubular extension 5, said rfhis invention pertains to an improved extension beingvprovided with a pair of method of forming twisted blades for the oppositely disposed straigl'it slots 6 and 7,

production of angers. Broadly considered the lower ends of whichv are in alinement G5 Vthe invention may be said to comprise the with the mouths of the slots 2 and 3 formed production of a spirally twisted blade from in the die. Ahollow plug 8 is screwed into fiat bar stoclr and inv employing means for the lower end of the body of the holder and vholding' the stock by its edges only as it is abuts the lower end of the die forcing the forced through the die and brought to the same upwardly in the holder against a desired spiral conformation. Another step shoulder 8a, set screws 9 and 10 being likepertains to the carbonization of the spiwise employed to assist in holding the die rally twisted blade prior to it-s final finishing. firmly in place and to prevent rotative ac- To produce such spirally twisted stock I tion .thereof as the blank is forced through preferably employ a. die. the interior of the die. A. plunger or ram 1]., operated 75 which is provided with two oppositely disthrough any suitable source of power` stands posed spiral slots, the pitch of the slots dein alinement with the bore of the die and creasing toward the discharge end of the bears against the end of the fiat bar or die, or, if desired, the spiral formation may stock which is to be forced through the die.

be obtained by using a plurality of dies Any suitable mounting for the die may be 80 successively, the dies being graduated so as employed. to partially twist the stock in succession so plurality of separate or abutting dies that the stock will ultimately emerge from may be employed in which the spiral grooves the last die with the spirals at an angle of gradually diminish in pitch until they come substantially 33o to the transverse axis. to the, 330 angle. 35

In the accompanying drawings, l have In operation T. take machine steel, which SllOWIl lll l all QmbOCllIlGDt O 2t clllCl 2L lllS lV low Carbon Content, as @Olnpaled 130 die holder employed in the process of twisttool steel, and place a section of it` in a ing the stoel; prior to its being welded to cold condition` in the guide formed in the the auge-r shank, provided with the cutting tubular extension. rl`he ram is then brought lo lips, carbonized, and finally sharpened, in against the end of the stock and the stock Fig. 2 a side elevation of an auger conis forced endwise through the straight struoted in accordance with my invention, grooves in the extension and through the and Figure 3 a transverse sectional view spira-l grooves in the die, the ram following illustrating the manner in which the stock is the blank until it is completely ejected from 95 held by its edges. the die. It will be note-d that the die con- No claim is made herein to the die nor to tacts the blank at its edges only. In other the apparatus whereby the stock may be words, the stock is held by and at its edges forced through the die, as that forms the only, and consequently friction is reduced basis of my copending application Serial to a minimum. This results in a material 190 No. 382,993 filed on or about the 20th day sar/*ing of power. lt has been found that of May, 1920, nor is any claim made herein the stoclr is not deformed except that at its to the particular form of cutting and chisel forward end it is slightly rounded and lips, as they form the basis of my applica emerges from the die in the form of a true tion filed. on or about July 9, 1919, Serial No. spiral with the desired degree of angularity.

309,555 lna'smuch as the ram is of a diameter less ln the drawings, (Fig. 1),1 denotes the die than that of the width of the stock it may body having two oppositely disposed spiral pass freely through the tubular guide and slots 2 and 3 formed therein, the spiral in likewise through the die so that the stock the instant case being shown as gradually is entirely discharged from the die and mi iii there is no occasion to open the die or make it in sect-ions longitudinally so that stock can be removed therefrom. y

The blank after being thus produced is welded Vto a shank 12 and has a floor lip cutter '13 formed upon one twist of the spiral and a chisel cutter let formed upon the land of the opposite spiral, as indicated in Fig. 2. It is also counterbored to form a socket for the reception of a removable center pin l5, after which the structure is carbonized, the degree oit earbonzation preferably being such as to leave the center of the stock unfected. The auger is then polished and the final edge nish is given to the floor lip and chisel cutters. Thus an auger is produced which has :a fine a mild machine steel may be employed and Worked cold, points of economy both as to initial cost and facility of Working. Where the ordinary cutter formation is employed or is to be produced the twisted blade may be carbonized throughout.

What is claimed is: Y

l. That method of producing aspirallyv twisted blade from flat bar stock, which consist-s in Aforcing 'the jstoelr into and through a. die having two oppositely disposed spiral grooves, the edges only of the stock engaging the grooves.

Q. That method of producing a spirally twisted blade fromY flat bar stock, which consists in entering the end of a bar into a pair of oppositely disposed spiral grooves formed in a die with the body of the bar intermediate the edges left unsupported and out of eontactwith the die, and thereafter forcing the blade through the die by endwise pressure exerted upon the blade.

3. That method of producing an auger blade of the double twist type froml Ylat bar stock, which consists in foreing the blade through a die having a pair of oppositely disposed spiral grooves of gradually7 decreasing pitch, the edges alone of theV blade engaging the grooves with the body of thepblade out of Contact with the Walls oi"v the grooves and die. i

In testimony whereof Ihave signed my name to this specification.

ARTHUR W. MoCUR-DY. 

